Behavior At Outer Corners; Behavior At Inside Corners - Siemens SINUMERIK 840D sl Function Manual

W5: 3D tool radius compensation
3.1 Function
between the activation block and the first corrected block or between the last corrected block
and the deactivation block. Other intermediate block are allowed, however.
3.1.3.5

Behavior at outer corners

In face milling, outside corners are treated like circles with a radius of 0, where the circular plane
stretches from the end tangent of the first block and the start tangent of the second block. Thus,
an orientation change during the block transition is also possible. Thus, a circle is always
inserted as a contour element at an outside corner. The intersecting point process is not
available for face milling.
Behavior during orientation changes
The G commands of Group 27 (too offset for orientation change at outside corners) can be used
to define whether orientation changes, which have been programmed between the two
traversing blocks that form the corner, are executed before the beginning of the inserted circle
set or at the same time.
● ORIC: Orientation changes at outside corners are superimposed on the circle block to be
inserted.
● ORID: Orientation changes are performed before the circle block.
If two or more blocks with orientation changes (e.g. A2=... B2=... C2=...) are programmed
between two traversing blocks and ORIC is active, then the circular block to be inserted is
divided between these intermediate blocks corresponding to the amount of the individual angle
changes. Further programmed intermediate blocks without traversing and orientation motions
are executed at the programmed positions.
If ORID is active, all inserted blocks (both those with and without orientation movement) are
executed at the end of the first of the two traversing blocks. The tangent in the end point of the
first traversing block is used for the offset calculation. The circle block with constant orientation
is inserted immediately before the second traversing block.
See also "Example 1: Orientation change at outside corner during 3D circumferential milling
(Page 268)".
3.1.3.6

Behavior at inside corners

The position of the tool in which it is in contact with the two surfaces forming the corner must be
determined at an inside corner. The contact points must be on the paths defined on both
surfaces. It is not usually possible to solve this problem exactly since, when the tool is moved
along the path on the first surface, it normally touches a point on the second surface which is
not on the path.
For this reason, the tool is not moved along the path on the first surface, but deviates from the
path in such a way as to ensure that the distance between the contact points and the relevant
contours in the position in which the tool contacts both surfaces is minimal, see also the
following Figure.
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Function Manual, 06/2019, A5E47435126B AA
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